<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>欢迎页面</title>

</head>
<body>
<div class="container">
    <h2>欢迎, <span id="username"></span>!</h2>
    <p>您已成功登录。</p>
    <button id="logoutButton">退出登录</button>
</div>

</body>
</html>